Since welcoming twins into their family earlier this summer, Beyonceand Jay Zhave been tight-lipped about their babies; aside from Beyonce's Instagram announcement, not much is known about their bundles of joy, but Jay did just open up about how he and Beyonce chose their names.

During an interview with Rap Radar on Friday, Jay explained that Rumi is named after 13th Century poet Rumi, while they came up with Sir's name off the cuff.

"Rumi is our favorite poet, so it was for our daughter," he said. "Sir was like, man, come out the gate. He carries himself like that. He just came out, like, Sir."

Jay went on to talk about Blue Ivy's feature on his latest album, 4:44; the 5-year-old's freestyle made quite an impression on fans earlier this summer.

"She got the headphones and she climbed on the little stool, and then she just started rapping," he said. "I was like, 'Oh, sh*t.' I have [her full freestyle session] on my phone. Five minutes! Five minutes of her doing that."

"She kept doing that 'boom shakalaka, boom shakalaka.' I was like, 'Oh, she understands the concept of a hook,'" he continued. "She's 5, and she understands the concept of a hook. I was like, 'What the f*ck is going on here?' One of the great memories."

Jay also revealed that his family will be coming on tour with him this year, saying, "I booked the tour for October so I could have at least four months to just really bond and see their fingers and sh*t like that."

"They'll be with me [on tour] anyway, but I'm just saying, like, [I needed] a space where I'm not doing anything," he continued. "I'm just focused on them. I'm not thinking about a show at night or anything like that. That's why the tour is so far away from the release of the album."